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m NA 0L A LR A m ,.R 0U B N. d 0 M 0 m No. 518,614. Patented Apr. 24,1894.

Fig-1 Witnesses: Inuentur 9 MZw 13 i 4w m device applied to an ordinarydoor.

, UNITED STATES PATENT OFFICE.

CHARLES .LLYONS, OF J OLIET, ILLINOIS, ASSIGNOR OF TWO-THIRDS TO HENRYJ. WEBER AND JOSEPH WEBER, OF SAME PLACE.

BU RGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 518,614, dated April24, 1 894.

Application filed January 2, 1 894. Serial No. 495,305. (No model.)

i f 111 Improvements in Burglar-Alarms, of which the following is aspecification, reference being had therein to the accompanying drawingsand the letters of reference thereon, forming a part of thisspecification, in which- Figure .1 is .a side elevation showing the aside elevation of the notched segment of the device to be applied to theshank of the door knob. Fig. 3 is a side elevation showing the deviceapplied to the jamb of a window. Fig. 4. is a bottom plan view of thedevice applied to a door, parts being broken away to more clearly showits construction. Fig. 5 is a perspective View of the notched segment tobe applied to the shank of the door knob. Fig. 6 is a side view of acircular notched wheel or disk to be used on the shank of the door knobin place of the notched segment,and Fig. 7 is a perspective view of atoothed rack to be applied to a window sash when the device is appliedto a window.

This invention relates to certain improvements in burglar alarms of theclass wherein the alarm device is connected with the shank of the knobof an ordinary door,and designed to be operated to sound an alarm whenthe knob is turned which improvements are fully set forth and explainedin the following specification and claims.

Referring to the drawings P represents an attaching plate designed to beattached to the side of the door by means of screws, and at a shortdistance from the shank K of the door knob 13. Gis an alarm bellattached to said plate 1? by means of a post 11 F is a lever pivotallyattached at q" to said plate. S is a spring having one end secured tosaid plate, and having its middle portion pass through the end of thelever F, the extending end thereof forming the striker arm J. E is alever pivotally attached to said plate at V near the inner end of leverF, and near enough thereto to be in contact therewith through theresiliency of spring S. 1

Ais a segment plate having its hub sleeved Fig. 2 is I on the shank K ofthe door knob B, and secured thereon by means of a set screw X. Theperiphery of said segment is provided with notches or teeth 72, whichare arranged to engage the outer extending end of the lever E fortripping the same as said segment is oscillated in either direction bymeans of turning the door knob B within the limits of the slot a in saidsegment, through which post 6 extends to limit such rotation oroscillation, and prevent lateral movement of said segment anddisengagement from the trip lever E. The hub of the segment A, may beopen at one side as shown in Fig. 2 to admit the shank of the door knobwithout having to remove the knob, or it may be circular as shown inFig. 5.

It is intended that the device may be applied to a window as well as toa door, as shown in Fig. 3. In such case the plate P may be attached tothe jamb or casingN of the window, and the window sash be provided witha toothed rack H for engaging and tripping the lever E.

When it is desired to use the device as an ordinary door bell where thedoor knob and its shank revolves, the segment A may be circular as shownin Fig. 5.

In operation when the device is applied to a door as shown in Figs. 1and 4, the teeth 7?. on the segment A, successively engage and trip theouter end of lever E, and thereby because of its engagement with lever Fcause it to oscillate and thereby cause the striker W, to ring the bellcontinuously as the knob is turned in either direction. When applied toa window the bell will ring as the window is moved up or down so long asthe trip leverE is in contact with the toothed rack 1-1.

When it is desired to detach the alarm device from the shank of the doorknob, so it may not be operated to sound an alarm, the trip lever E maybe turned to the position shown in broken lines in Fig. 1, where it willbe held by the leverFout of contactwith the notched segment, or rack ifused on a window.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is as follows:

1. In a burglar alarm the combination of the attaching plate P carryinga bell G, lever F pivotally connected to said plate, spring S forconnecting the rear end of said lever-with said plate, and terminatingin a striker-arm" J, trip lever E pivotally connected to saidstriker armon its outer end, a trip lever pivotallyconnected to said plate parallelwith 15 and in contact with said striker-lever, aspring for preservingthe contact of said levers, and

,a notched segmentor wheel arranged on the door knob shank for trippingsaid trip lever all arranged to operate substantially asand 20 for thepurpose setforth,

CHARLES J; LYONS.

Witnesses:

Tnos. H. HUTCHINS, HENRY'J. WEBER.

